She said that's when her brother, 31-year-old Aaron Montoya, came out of the house holding a kitchen knife and began attacking his father.

His father was eventually able to tackle Montoya to the ground and Cassandra held him down until police arrived.

She said her brother did not live in their home and was not supposed to be on their property because of his violent past.

"He's not supposed to be here because killed my dog a year ago," she said.

Cassandra said he stabbed their dog multiple times in October of last year.

Despite his violent past, she said she doesn't believe he would ever hurt her.

"I've never ever thought that he would hurt me," Cassandra said. "That's why after a second, I went to go help my step-dad because one, I just couldn't not do anything but two, I don't think he would hurt me."

She said her brother suffers from mental health and drug issues.

"I also know he's got mental health issues so I was honestly afraid I was going to lose my stepfather, because I mean, it looked like I was going to lose him," Cassandra said.

Police said the father had several small cuts to his head and hand but didn't go to the hospital.

Cassandra said her stepfather did go to the hospital on Saturday to get checked out.

Montoya was lodged at the Lane County Jail for Assault, Burglary, Unlawful Use of a Weapon, and Disorderly Conduct.

Anyone who may have witnessed the incident is requested to contact the Springfield Police Department at 541-726-3714.